Marcia sports a cheerful demeanor, but is known to enter bouts of anger towards her brother and enemies alike. It is revealed in supports with Tanith that she is extremely proficient in executing her duties as a Pegasus Knight, with Tanith revealing that she holds very high expectations of Marcia, even to the extent of having faith in Marcia being able to lead the Holy Guard. One of Marcia's distinctive traits can be observed in the manner in which she speaks. On various occasions, she is known to use words such as "clambake" and "sponge-brain" as insults. Furthermore, in place of profanities, Marcia will use words such as "crackers", hinting at the possibility of her being rather childish.